Insecticide package



Dec. 8, 1953 .L A. 0 2,661,981

VINSECTICIDE PACKAGE Filed July 12, 1949 4 Sheets-Sheet l E in mi.

Wmiim @1270 INYEQTOIR B'Y OW. QOQM ATTORNEYS.

Dec. 8, 1953 J. A. OKlE 2,661,981

INSECTICIDE PACKAGE 4 Sheets-Sheet 5 Filed July 12, 1949 Dec. 8, 1953.i. A. OKIE 2,661,981

} INSECTICIDE PACKAGE Filed July 12, 1949 4 Sheets-Sheet 4 INVENTOR 5QZvw/LOM relatin t the paekagine m her.- .i m an Patented Dec. 8, 1953 Psy a a apniieati nJl ix-ia 1 artist ag (creas -2p- T e present :hment enx ates opaekaeesi insect c dee to pnopesvs si oi packa ing. and t9 Pa gn mec anism v he p ese t applicat on hasxbeen-td t de the s hie ma er nthe p oces le exir 1n my a p cat o er a No- 168 7,, fil d-J j e 1. 959 rMethod f Packa ing an th euhieetmette pee i :my atent a plica iqn S ial:Ne- .llfififliifi. fi ed J e V1 .1950 ie Bae egin tM -e eni m- Hathoftla sea 110W a en en d- A purpos o he ntentie -is 129 @aektsfifi hdaraichm ze e inely thylenetagewhiqh i r adily nervioin to the vapp 9thene tad -Qh Q 6 Z6I Q 3 1 211 2 3 win -501 h fl tin h lsel' d mat r alanshn m t he e1 f metefii qhlfl qb zmefla the bag. 7

A further purpose :is to surround ,;an elongated i d pipe r n0 z1 an nther o las c plastic tu e P ef ab c inkled .:on the pi e to e c siv chae 10 mamm l-t h p eka ed h u h he p ne. an t l ea sea a dw fl suc sive as :Qf. n t c at t e nd th plpe.

A; furthe rpos i o imu ta u y heat seal-and. cutthetubebyazheatedtknife.

A f t er purpes i opl p h tub t nte t le side of the point of puttingand ;heat sealing,gpreferably :by a sh n a ai wh ch t k i e 10,!,erates,

A fu t er purpose isto fee i he t e n qete sive1y downward under theweight of eachenccessive charge of-materia1;to be packaged.

,A further purposeiis to advance the knife byp vplunger ,or plungers;desirably pperated by the same mechanism which operates :the feed,

Furth r p poses appear n :the .epecifieet .andin the claims.

In the drawings I have;chosen;to illustratekpne only of thenumerousyembodimentsin'whichgny invention. appears, selecting theform-shown f rqm the vstandpoints of lconvenienqe illustratiqp,

satisfactory operation and clear demonst gation *Of the principlesginvolved.

:Figure :1 i5 2. diagrammatic persnectiveivie n :the machine employedin-the present invention, remitting-the plastic tube. V

Figure2 is anenlarged fragmentary front perspective of the cutting andheat. :sealing-meehavnism' ofFigure 1,;and;inc1uding;the thermoplastic;p1astic;tube omitted imFigure 1.

- Fi ure 3 isaiea he p et v lqfz he m chaniem eh n Figure 21mm; thetreat. 1

Figure .4 is-an enlai ged fragmentary -seetional perspective of thewheat sealing and putting.

Figure 5 is .a iragmentary perspective, of the knife andit supportnetsitructnref 'Figure 61s persp ct ve illus a ing the th eadin .0 th pn th eaten theitherm nlasti plastic tube. a

JFig a lll iqn t w iq q li fiedihae' ichlerhenzen'e, beta 9 the Lasheeed per at the mement .oj he matte? i ectmoiw .1.1

Man 6 the azaileb e p asti ma e ai 13 116 ;1 10t. ell'fipitqdIjQ 11 einvapors,'andit is necessafy: a A 111 .Qr. e orate themt invo cger thathe taper e tate tEv-en m enihi b mama thee; that Ragmibt pnenines Q1:em nentl etendemyim xey n w w 0 flake artiste eea td 1 .19.

esc pe gr. tew v ta hiaiete vapor W11]. freely pass through thepolyethylene heating head.

. 31 charge into the end behind the heat seal, and then heat sealing andcutting off the tube behind the charge. I find that the new heat seal;

for the next bag can conveniently be made at the same time.

The tubular polyethylenesheet is conveniently supplied in a roll asshown in Figure 6.. A suit i adjoining the roll 23 and the feed pipe isplaced.

in a vertical position with sufficient inclination to provide gravityfeed of material as shown in Figures l and 2. f

For connection tothe feed hopper, the top of the pipe is desirablyprovided with a funnel 24.

At the lower end of the pipe it is suitably engaged by a spring grip 25which holds back the mass of crinkled plastic tube and allows the lowerend of the tube to feed downward as the weight of each successive chargepulls down on the tube. Thus the lower portion 23 of the tube below thegrip 25 is comparatively straight and free from crinkling.

Below the end of the pipe and at one side of the tube are located spacedclamp pads 2'! and 28 on either side of an intermediate slot30'extending transversely of the tube. The pads 21 and 28 are mounted ina frame 3| which is resiliently'supported on guide bolts 32, the boltsbeing mounted on asuitably upstanding portion 33 of a machine bed 34.Between the portion 33 of the bed 34 and the frame 3|, the bolts 32 aresurrounded by springs 35 which urge the frame toward the plastic tube.

Cooperating with the pads 21 and 28 of the clamp and bridging'the slot30 is a cushion 33 on the other side of the tube, pivoted at 31 to theupstanding portion 33 of the bed 34 on one side of the frame and,inclosed position as seen in Figure 1, latching at'38 to the'oppositeside of the portion 33 of the bed plate. When the cushion is slightlycompressed so that the pads firmly grip the tube against thecushion oneither side of resisting fabric or elastomer which does not weld withpolyethylene. For example, a cotton fabric coated with a commercialsilicone oil has been found to be quite satisfactory. Any other wellknown heat sealing cushion material may be a to be packaged, a length ofthermoplastic plastic used.

The lower portion of the frame 3| is recessed at 42 to aid in access tothe finished bag by the I ceive guide bolts 43 from guides 50 on thebed, to

. 4 a knife 5| extending across the length of the slot 30. The knife isan elongated metal strip having a cutting face 52 and having endterminals 53. In the preferred embodiment it is made of a suit ableelectrically conducting metal of relative high electrical resistance,such as steel, Nichrome, or

' bronze.

from their source of air pressure.

The fluid under pressure is received through a main pipe 60 and apressure regulator 6| to a main control valve 62 in position to beoperated in any suitable way. In the illustration shown it has not beenconsidered necessary to mechanize the operation of the valve 62 by themachine and accordingly it is placed for operation by the hand of theoperator. Beyond the valve 52 the fluid pipe branches at 63, one branch58 passing to the air cylinders for the knife as already explained.

Another branch passes to an air cylinder 34 which operates a piston 35pivotally connected to a lever $5 which is mounted on a fixed pivot 31.Intermediate between the ends, the lever connects to a suitable flexibleconnection 68 which passes over guide pulleys and connects to a rockerarm ii on a rock shaft '32. The rock shaft carries another rocker arm13, spring urged by a spring 14 to the position of actuation when nectedat 15 to a valve 15 in the bottom of a hopper llccntaining material tobe packaged,

pressed into latching position the springs 35 are hand for removal.Spaced at a suitable distance below the slot 33 is the bottom abutment43 guide the forward and retraction motion of the Mounted on the head 46at its opposite end sis such as paradichlorbenzene crystals. Below thevalve a pipe l3 leads into the funnel 24 at the top of the feed pipe 22.The rock shaft 12 has another rocker 3% which is connected by a link 8|to a rocker 82 on a rock shaft which extends across the top of thehopper and carries agitators 84 in the hopper.

Figure '7 illustrates bag 85 which has been filled with its contents {3and has just been cut on line 83 and heat sealed on both sides of that'line.

Immediately above the bag 85 the next bag is partially formed, havingbeen heat sealed at the bottom and having received its charge ofmaterial 88 to be packaged.

In operation, with the hopper full of material "considerable amount ofplastic tubing can be threaded on the pipe.

The pipe, threaded through the plastic tube, is now placed in positionin the machine as shown in Figure -1, and the bottom of the tube ispositioned slightly below the slot 30 while the clamp is locked byswinging the cushion into the closed position and engaging it with thelatch 38, thus gripping the tube. The valve 32 is then opened, actuatingpneumatic or other fluid plung- ,ers 51 to move the knife forwardagainst the tube. The knife is hot due to the resistance heat- ..ingfrom the electric current, and in a few seconds it cuts the plasticwhile at the same time the knife sides on either side of the actualcutting edge fuse together the plastic on both sides of the cut. Thissame behavior will occur whether the plastic is polyethylene or someother thermoplastic plastic such as polyvinyl chloride, polyvinylacetate, polyvinyl chloricle-acetate, cellulose acetate, celluloseacetate-butyrate, or the like.

At the same time that the opening of valve 62 causes the knife to moveforward, the pressure fluid is admitted into the cylinder 64, causingthe piston 35 to move up and likewise swinging the lever 56 up at itsfree end, and allowing the flexible connection 33 to move up under theaction of spring 76. This causes the rock shaft to open the valve 16 andto move the agitators 82 in the hopper, so as to discharge a charge ofmaterial through the pipe 78 into the funnel 26 and down the feed pipe22 into the bottom of the plastic tube. The valve in the hopper may beof the measuring type as well known, which will discharge the samecharge regardless of how long it is kept open.

As soon as the valve has been open for a sufficient length of time toallow the knife to cut and heat seal the tube, the operator will closethe valve, thus causing the knife to retract under the action of thesprings in the cylinders 57, and thus causing the hopper valve 76 toclose by the action of the spring in the cylinder 64 which moves thepiston 65 downward and pulls down on the flexible connection 68 to closethe valve 13 and at the same time again agitate the hopper.

As soon as the heat seals have cooled slightly, the operator opens theclamp by releasing the latch 33 and swinging the cushion to the positionshown in Figure 2. The bulk of the crinkled portion of the tube abovethe spring grip 25 does not feed down due to the engagement of thespring grip but the lower portion 25 feeds down under the action ofgravity of the charge until it touches the abutment s3, and the lowerportion 23 is comparatively smooth and free from wrinkles, but flattenedas shown in Figure 2.

The operator now again closes the clamp to make the cutoff and seal atthe top of the first bag and the seal at the bottom of the next bag, andopens the valve 62, causing the knife to move into contact with thetube, cutting it and heat sealing at both sides of the cut. At the sametime the air cylinder 64 causes the hopper valve to open and deposit acharge of material to be packaged in the bottom of the next bag. As soonas the valve 62 is closed the knife retracts and the hopper valvecloses. The bottom of the tube is then in the condition shown in Figure7, the bottom bag 85 being fully heat sealed and just cut off and thenext bag having received its heat seal immediately above the cut line86, while the next charge has entered the bag above. There are thus twocharges, 81 in the lower bag and 88 in the upper bag.

It will be evident that while the charge 88 above the out comes downwhile the cut and heat seals are being made, due to the clamping theweight of this charge is not borne by the upper heat seal until afterthe clamp is removed. Therefore the heat seal by this time is somewhatcooled and therefore stronger.

As soon as the clamp is opened, the lower bag is removed from itsposition on the abutment 43 and dropped through opening 44 into thedis-' charge chute 45. Due to action of gravity under the Weight of thecharge 88, the forward or lower end of the tube now moves downward un'til it contacts the abutment Thus the feed ing of the plastic tube isaccomplished by the combination of the gravity action on the charge andthe retarding action of the spring grip 25. The next operation can thenbegin, by again closing the clamp, opening and then closing the valve52, opening the clamp, removing the lower bag, and allowing the next bagto feed under gravity action.

It will be evident that by the present invention it is possible topackage a large number of bags with any suitable material, preferably adry granular or powdered material, and the invention is thereforeapplicable to a wide variety of plastic packaging tubes and materials tobe packaged, although it is primarily intended for use in obtaining avapor permeable package of paradichlorbenzene by flexible polyethylenesheet.

Itwill be evident that while a flexible polyethylene bag is fullypermeable to the vapor of paradichlorbenzene it isotherwise'hermetically sealed, and therefore will not accumulatemoisture or allow escape of solid material.

The bag is at the same time so soft'and convenient that it can bereadily used as the manner of a sachet bag to intersperse among clothingand provide protection against insects, particularly moths.

In view of my invention and disclosure variations and modifications tomeet individual whim or particular need will doubtless become evident toothers skilled in the art, to obtain all or part of the benefits of myinvention without copying the process, machine and product shown, and I,therefore, claim all such insofar as they fall within the reasonablespirit and scope of my claims.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is:

1. An insecticidal article which comprises: (1) a sealed bag ofpolyethylene sheet which freely passes the vapor of paradichlorbenzeneand (2) solid paradichlorbenzene in the bag, the vapor of theparadichlorbenzene passing freely through the bag and entering the airaround the bag, the polyethylene sheet being exposed freely to theatmosphere on the outside and to the paradichlorbenzene on the inside.

2. An insecticidal article consisting of (1) a tube consisting ofpolyethylene sheet having fused seals at both ends and (2)paradichlorbenzene inside thereof, the polyethylene sheet being exposedfree to the atmosphere on the outside.

3. The use of a sealed polyethylene envelope, freely exposed to theatmosphere on the outside, and having paradichlorobenzene on the inside,to inhibit insects in places outside of said envelope.

JOHN A. OKIE.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 1,758,347 Beiben May 13, 1930 2,160,367 Maxfield May 30, 19392,232,783 I-Iausheer Feb. 25, 1941 2,237,119 Smith Apr. 1, 19412,265,253 Smith Dec. 9, 1941 2,281,760 Glaskowsky May 5, 1942 2,452,957Sabin Nov. 2, 1948 2,520,737 Romeyn et a1 Aug. 29, 1950 2,584,722 LondonFeb. 5, 1952

1. AN INSECTICIDAL ARTICLE WHICH COMPRISES: (1) A SEALED BAG OFPOLYETHYLENE SHEET WHICH FREELY PASSES THE VAPOR OF PARADICHLORBENZENEAND (2) SOLID PARADICHLORBENZENE IN THE BAG, THE VAPOR OF THEPARADICHLORBENZENE PASSING FREELY THROUGH THE BAG AND ENTERING THE AIRAROUND THE BAG, THE POLYETHYLENE SHEET BEING EXPOSED FREELY TO THEATMOSPHERE ON THE OUTSIDE AND TO THE PARADICHLORBENZENE ON THE INSIDE.